aya-ebpf: Validate the pointer alignment in `Array::get`

ebpf/aya-ebpf/src/error.rs

@@ -0,0 +1,3 @@
+use crate::cty::c_long;
+
+pub const EINVAL: c_long = 22;

ebpf/aya-ebpf/src/lib.rs

@@ -23,6 +23,7 @@ pub use aya_ebpf_bindings::bindings;
 
 mod args;
 pub use args::{PtRegs, RawTracepointArgs};
+pub mod error;
 #[expect(clippy::missing_safety_doc, unsafe_op_in_unsafe_fn)]
 pub mod helpers;
 pub mod maps;

ebpf/aya-ebpf/src/maps/array.rs

@@ -4,6 +4,7 @@ use aya_ebpf_cty::c_long;
 
 use crate::{
     bindings::{bpf_map_def, bpf_map_type::BPF_MAP_TYPE_ARRAY},
+    error::EINVAL,
     insert, lookup,
     maps::PinningType,
 };
@@ -48,9 +49,19 @@ impl<T> Array<T> {
     }
 
     #[inline(always)]
-    pub fn get(&self, index: u32) -> Option<&T> {
-        // FIXME: alignment
-        unsafe { self.lookup(index).map(|p| p.as_ref()) }
+    pub fn get(&self, index: u32) -> Result<Option<&T>, c_long> {
+        unsafe {
+            match self.lookup(index) {
+                Some(p) => {
+                    if p.is_aligned() {
+                        Ok(Some(p.as_ref()))
+                    } else {
+                        Err(-EINVAL)
+                    }
+                }
+                None => Ok(None),
+            }
+        }
     }
 
     #[inline(always)]